George Brock was born to Philip and Lavina Moser Brock 5 June, 1822. The Brock (Brack) family from Germany first settled in Pennsylvania sometime before 1725. Migrations took them to Kentucky where George was born. In time the family migrated to Indiana and thence to Iowa where George enlisted 2 August, 1861 at age 39.

The 4th Regiment Iowa Infantry was organized in Council Bluffs, Iowa, and mustered in 6 August, 1861. It moved to St. Louis and then to Rolla, Missouri. George was discharged there 19 October, 1861 "by reason of an old wound dividing the flexor tendons of the right foot." No indication was given as to how or when the old wound came about. He had been assigned to Company I.

He married Harriet Sutton 22 December, 1842 (possibly his second marriage) and left his wife and six children to go to war. He returned home and to their farm, dying 26 April, 1906 at Seymor, Iowa. Patriotism to the Union, however, was engraved in this family, for the following year his son, Phillip, enlisted in the Iowa infantry (with written family consent) at age 19.